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<br /> <br />'- <br /> <br />" <br /> <br />'- <br /> <br />c; "It ~~' ,~ <br />"';I 'Or <br /> <br />BASALT PROJECT <br /> <br />VlATER SUPPLY <br /> <br />Reservoir sedimentation <br /> <br />Ruedi Reservoir water conveyed to the Missouri Heights Reservoir <br />through the Basalt Conduit would be essentially free of sediment. It is <br />estimated that Cattle Creek water conveyed to the reservoir through the <br />Mount~in Meadow Canal would deposit about 400 acre-feet of sediment over <br />a 100-year period. About 300 acre-feet of this sediment would be depos- <br />ited in the active storage pool and 100 acre-feet in the dead storage <br />pool. Thi.s small amount of sediment may not justify an allowance for <br />sediment space in the reservoir. The sediment estimate is based on a <br />yield of 0.25 acre-foot annually per square mile of drainage area with <br />a trap efficiency of 90 percent. <br /> <br />Reservoir evaporation <br /> <br />Evaporation from the enlarged Missouri Heights Reservoir would <br />average about 600 acre-feet annually. This is equivalent to a loss of <br />1.05 feet of water over the reservoir surface area. The evaporation <br />rate is estimated to be the same as for the existing Vega Reservoir of <br />the Collbranproject "hich is at about the same elevation as the Missouri <br />Heights Reservoir. <br /> <br />Operation results <br /> <br />A11 annual summary of the project operation stu~y is tabulated on <br />the following page. The irrigation water supply available under project <br />operation would average 72,300 acre-feet annually consisting of a present <br />supply of 13,800 acre-feet and a project increase of 58,500 acre-feet. <br />About 52,700 acre-feet of the project increase would be used on lands <br />not present~y irrigated and the remaining 5,800 acre-feet would be used <br />to reduce shortages on lands now irrigated. All project lands, including <br />both f1.l11 and supplemental service lands, would have an average annual <br />shortage or about 1,700 acre-feet, equivalent to about 2.3 percent of <br />the ideal water requirement. <br /> <br />Stream Denletion <br /> <br />Operation of the Basalt project would deplete the flOi? of the Roar- <br />ing Fork and Colorado Rivers by en estimated average of 26,000 acre-feet <br />annuallY, made up of consumptive use components as shown in the table on <br />page 33. <br /> <br />31 <br /> <br />